Effects of lanthanum addition on the microstructure and corrosion resistance of galvanized coating
| Autor: | Wen-can Xu, Qian Li, Kuo-Chih Chou, Zhi-hong Zhang, Yu-bao Liu, Liang Wei, Hong-Qiang Fan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Scanning electron microscope chemistry.chemical_element 02 engineering and technology Zinc engineering.material 010402 general chemistry 01 natural sciences Corrosion law.invention symbols.namesake Coating Optical microscope law Materials Chemistry Lanthanum Mechanical Engineering Metals and Alloys 021001 nanoscience & nanotechnology Microstructure Galvanization 0104 chemical sciences chemistry Mechanics of Materials engineering symbols 0210 nano-technology Nuclear chemistry |
| Zdroj: | Journal of Alloys and Compounds. 784:859-868 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2019.01.075 |
| Popis: | Based on the test results of the La solubility in iron-saturated liquid zinc, the galvanized coatings with the unsaturated (0.006 wt%), saturated (0.012 wt%), and supersaturated (0.2 wt%) lanthanum (La) additions were prepared on mild steel surface in this study. The microstructure and corrosion resistance of coated specimens were studied by optical microscope (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), weight loss tests and electrochemical methods. These results illustrated that La partially dissolved in Zn. On the other hand, La reacted with Zn to form LaZn13 and promoted the dendritic growth of coating. The weight loss of La-containing galvanized coatings decreased by 5–25% gradually due to the inhibition of cathodic reaction. The results of SKP indicated the number of micro cells decreased with the La addition. |
| Databáze: | OpenAIRE |
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